{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["GENE"], "input": "Interspecific backcross analysis using progeny derived from matings of ( C57BL / 6J x Mus spretus ) F1 x C57BL / 6J mice indicates that the thrombospondin gene is tightly linked to the Fshb , Actcl , Ltk , and B2M loci on murine chromosome 2 ."}
{"GENE": ["thrombospondin gene", "Fshb", "Actcl", "Ltk", "B2M loci"]}